As Nordea Bank AB blazes a trail in Europe by banning its employees from trading Bitcoin and other cryptocurrencies, the regulator is taking a back seat in a decision-making process it says is better left to the industry. Sweden’s Financial Supervisory Authority thinks “every institution must decide on the details of their internal regulations specifying the rules for their employees’ investments and trading,” spokesman Peter Svensson told Bloomberg, in response to questions about Bitcoin guidelines. The hands-off approach may surprise some who associate the Nordic region, and Sweden in particular,…